Senior Software Engineer – Frontend (Digital)

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.

Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.

Role Overview

As a Senior Software Engineer on the Digital Team, you will design, develop, and maintain frontend software solutions supporting Five9’s digital initiatives. This role focuses on building scalable, reliable, and high-performance frontend applications.

Our dedicated team is committed to optimizing user experiences, streamlining workflows, and enhancing productivity across the board. Whether empowering agents with intuitive interfaces, empowering supervisors with powerful management tools, or enabling seamless access to critical applications across multiple platforms, we strive to deliver with utmost efficiency and customer satisfaction.

You will be responsible for developing, maintaining, and advancing the applications and component library across Five9. Responsibilities include software design and development, testing, and documentation across our React component library and applications. A passion for developing consistent, high-quality, and performant user interfaces is essential. The role also involves deep technical exploration of emerging technologies and partnering with product teams to bring innovative ideas into production.

In addition, this position plays a key role in mentoring other engineers and driving frontend engineering best practices across Five9.

How You Contribute

• Build reusable, responsive, and WCAG-accessible components for our design system and web applications. Translate Figma designs into component code aligned with design specifications.

• Maintain and organize the Design Token system, bootloader, and codemods in collaboration with other Nimbus developers and the design team.

• Continuously improve our React component library with the latest frontend packages, patterns, and best practices.

• Ensure seamless deployment by implementing CI/CD, unit tests, integration tests, and visual regression tests; publish and communicate component library enhancements.

• Collaborate closely with cross-functional teams including the design team, product managers, UI architects, and frontend developers to build new components and enhance existing components.

• Advocate for and propose standards, best practices, and guidelines to ensure high-quality, scalable, and maintainable code.

• Mentor and support team members through quality-focused code reviews, strategic planning, and knowledge-sharing initiatives.

Required Skills and Qualifications

• 5+ years of post-internship experience with React and TypeScript.

• Strong proficiency in semantic HTML, CSS (preferably SCSS), and JavaScript.

• Experience with component libraries, design systems, and design tokens.

• Strong attention to detail and problem-solving skills.

• Strong expertise in Web Content Accessibility Guidelines (WCAG).

• Experience with frontend tooling and migration, preferably Vite and Codemod.

• Experience with testing frameworks and tools such as React Testing Library, Enzyme, Cypress, and Chromatic.

• Experience working closely with designers using Figma.

• Excellent English communication skills, both verbal and written, with a proactive approach to collaboration.

• Self-motivated, enthusiastic, and ownership-driven, with a strong commitment to delivering solutions.

• Bachelor’s degree (or equivalent) in a relevant discipline.

Desirable Qualifications

• Experience with Tokens Studio and Style Dictionary for managing Design Tokens.

• Experience with Storybook.

• Experience with bundlers such as Rollup.

• Deep understanding of CORS, CDNs, and i18n.

Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills.  The more inclusive we are, the better we are.  Five9 is an equal opportunity employer.

View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal.

Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.